Mary clapped her hand over her mouth _______ she realized what she had said.

28The firm invested approximately 60 million dollars in________it says is the world’s largest bottle-bottle recycling plant

Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours.

“Changes should be made in the prison for the conditions there are _____,” said the reporter．

Mrs. Black has three children. One is in Paris, and _______are in another city.